Big Block External oiling

I was looking at a magizine yesterday and I saw something about plugging the suction hole om the block side where the pump mounts. If you use a external pick up line like one from Milodon. I blocked off where the Factory pick up tube threads into the stock location inside the block.

If the hole is plugged inside the oil pan wont that be the same?
Should be fine. It will pull a suction against plugged galley. I plugged mine too and bottom just to make sure it never sucked air